Configuration of non-orthogonal DMRS for uplink transmission

Patent metadata

Field	Value
Publication number	US-11533143-B2
Application number	US-201916963453-A
Country	US
Kind code	B2
Filing date	Feb 6, 2019
Priority date	Feb 9, 2018
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

The present disclosure relates to wireless communications implemented by a user equipment (UE). The UE may receive a demodulation reference signal (DMRS) sequence grouping from a base station, select a DMRS sequence for transmission of DMRS based on the DMRS sequence grouping, and transmit uplink (UL) data along with the DMRS for UL transmission using contention-based protocol, wherein the DMRS is transmitted based on the selected DMRS sequence.

First claim

What is claimed is:

1. A method for wireless communications implemented by a user equipment (UE), comprising:
receiving a demodulation reference signal (DMRS) sequence grouping from a base station;
selecting a DMRS sequence for transmission of DMRS based on the DMRS sequence grouping; and
transmitting uplink (UL) data along with the DMRS for UL transmission using contention-based protocol, wherein the DMRS is transmitted based on the selected DMRS sequence,
wherein selecting the DMRS sequence for transmission of DMRS based on the DMRS sequence grouping comprises concatenating a plurality of base sequences to construct a composite DMRS sequence, wherein the plurality of base sequences includes at least two sequences, the method further comprising:
transmitting the composite DMRS sequence in one or more of slots of a plurality subframes, wherein a first DMRS sequence is transmitted in a first slot and a second DMRS sequence is transmitted in a second slot;
performing a cyclic shift hopping on the first DMRS sequence based on a base sequence index of the second DMRS sequence; and
performing a cyclic shift hopping on the second DMRS sequence based on a base sequence index of the first DMRS sequence.

2. The method of claim 1 , wherein the DMRS sequence grouping is received from the base station in system information blocks (SIB), and
wherein the DMRS sequence grouping identifies a subset of DMRS sequence grouping and an associated reference signal received power (RSRP) threshold for each group in the DMRS sequence grouping.

3. The method of claim 1 , wherein receiving the DMRS sequence grouping comprises:
receiving a group number and a sequence index associated with the DMRS sequence grouping.

4. The method of claim 1 , further comprising:
configuring a transmission power of the UE for the selected DMRS sequence based on the DMRS sequence grouping.

5. An apparatus configured for wireless communications, comprising:
a memory comprising computer-executable instructions; and
one or more processors communicatively coupled with the memory, the one or more processors configured to execute the computer-executable instructions and cause the apparatus to:
receive a demodulation reference signal (DMRS) sequence grouping from a base station;
select a DMRS sequence for transmission of DMRS based on the DMRS sequence grouping; and
transmit an uplink (UL) data along with the DMRS for UL transmission using contention-based protocol, wherein the DMRS is transmitted based on the selected DMRS sequence,
wherein the one or more processors are configured to execute the computer-executable instructions and cause the apparatus to: select the DMRS sequence for transmission of DMRS based on the DMRS sequence grouping by concatenating a plurality of base sequences to construct a composite DMRS sequence, wherein the plurality of base sequences includes at least two sequences,
wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to:
transmit the composite DMRS sequence in one or more slots of a plurality subframes, wherein a first DMRS sequence is transmitted in a first slot and a second DMRS sequence is transmitted in a second slot;
perform a cyclic shift hopping on the first DMRS sequence based on a base sequence index of the second DMRS sequence; and
perform a cyclic shift hopping on the second DMRS sequence based on a base sequence index of the first DMRS sequence.

6. The apparatus of claim 5 , wherein the one or more processors are configured to execute the computer-executable instructions and cause the apparatus to:
receive the DMRS sequence grouping in system information blocks (SIB),
wherein the DMRS sequence grouping identifies a subset of DMRS sequence grouping and associated reference signal received power (RSRP) threshold for each group in the DMRS sequence grouping.

7. The apparatus of claim 5 , wherein the one or more processors are configured to execute the computer-executable instructions and cause the apparatus to:
receive the DMRS sequence grouping by receiving a group number and a sequence index associated with the DMRS sequence grouping.

8. The apparatus of claim 5 , wherein the one or more processors are configured to execute the computer-executable instructions and cause the apparatus to:
configure a transmission power of the UE for the selected DMRS sequence based on the DMRS sequence grouping.

9. A non-transitory computer-readable medium comprising computer-executable instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to perform a method of wireless communication, the method comprising:
receiving a demodulation reference signal (DMRS) sequence grouping from a base station;
selecting a DMRS sequence for transmission of DMRS based on the DMRS sequence grouping; and
transmitting uplink (UL) data along with the DMRS for UL transmission using contention-based protocol, wherein the DMRS is transmitted based on the selected DMRS sequence,
wherein selecting the DMRS sequence for transmission of DMRS based on the DMRS sequence grouping comprises concatenating a plurality of base sequences to construct a composite DMRS sequence, wherein the plurality of base sequences includes at least two sequences, the method further comprising:
transmitting the composite DMRS sequence in one or more of slots of a plurality subframes, wherein a first DMRS sequence is transmitted in a first slot and a second DMRS sequence is transmitted in a second slot;
performing a cyclic shift hopping on the first DMRS sequence based on a base sequence index of the second DMRS sequence; and
performing a cyclic shift hopping on the second DMRS sequence based on a base sequence index of the first DMRS sequence.

10. The non-transitory computer-readable medium of claim 9 , wherein the DMRS sequence grouping is received from the base station in system information blocks (SIB), and wherein the DMRS sequence grouping identifies a subset of DMRS sequence grouping and an associated reference signal received power (RSRP) threshold for each group in the DMRS sequence grouping.

11. The non-transitory computer-readable medium of claim 9 , wherein receiving the DMRS sequence grouping comprises:
receiving a group number and a sequence index associated with the DMRS sequence grouping.

12. The non-transitory computer-readable medium of claim 9 , the method further comprising:
configuring a transmission power of the UE for the selected DMRS sequence based on the DMRS sequence grouping.

Assignees

• Wei Chao
• Li Qiaoyu
• Cheng Peng
• Qualcomm Inc

Inventors

• Wei Chao
• Li Qiaoyu
• Cheng Peng

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L5/0051 Primary

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W52/325

  Power control of control or pilot channels · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L27/2614

  Peak power aspects · CPC title